Cash register



Oct. 16,1934. w KROPFF 1,977,069

CASH REGISTER Filed Jan. 24, 1929 2 Sheets-Sheet l gm cantor,

Wilhelm Kropfi Hi3 attouwqa Get. 16, 1934. w P F 1,977,069

CASH REGISTER Filed Jan. 24, 1929 2 Sheets-Sheet 2 Wilhelm Kropfl His 6110: 2%

Patented Oct. 16, I934 .VVilhelm Kropfi", Berlin-Charlottenburg,

Ger

many, assignor to The National Cash Register Company, Maryland Dayton, .Ohio,

a corporation of Application January 24, 1929, Serial No. 334,792

. In Germany April 21, 1928 23 Claims. (01. 235- 120) This invention relates to registers and like machines, with particular reference to locking mechanisms for cash registers.

, I, Gash registers and accounting machines gen erally are provided with manipulative means adapted to be moved into a plurality of positions to control the machine for adding, totaliaing, and sub-totalizing operations. v

However, to prevent theoperators and clerks ".10" from acquiring a knowledge of the total amount of business transacted, for example, or other information accumulated in the register which the proprietor wishes to maintain secret, it is often desirable to render certain of. the posi- (515 tions into which the manipulative control means may be-moved, inaccessible to all but the proprietor or other duly authorized persons. This has been accomplished, heretofore, by providing plurality or bolts controlled by removable keys, and adapted to prevent, the adjustment of tlie nianipulative meansto certain of its posinon but this method has been found slow and cumbersome. V

It is, therefore, an object of this invention to provide, in a cash register or accounting machine having an adjustable state-controlling device, a novel locking means whereby a single lock operated in conjunction with said adjustable device, determines whether or not the machinejshall operate when the state-controlling device is, in one or another of its positions.

Another object is to provide a novel controlling mechanism whereby a state-controlling .device, ,a.djllSl 8tb1S to a plurality of positions, is free to U be moved to any of its controlling. positions, but which, when-moved to certain thereof, prevents the operation of the machine.

Another object is to provide a novel control- 40 lingflmeans whereby. movement of a state-controlling deviceto certainof the plurality of positions to which it may be adjusted, prevents operation of the machinaand movement of the state-controlling device to certain other of its 'ad justed' positions permits operation of the machine. 'With these and incidental objects in view, the invention consists of certain novel features of construction and combinations of parts, the es sential elements of which are set forth in appended claims and. a preferred form or embodiment oi which is hereafter described with reference to the. drawings which accompany and gform a part of this specification.

a In the drawings:

Fig. 1 is a side view, partly broken away, of a manipulative state-controlling means and the mechanism operated thereby to lock the machine against operation when the controlling means is adjusted to certain of its positions. w I

Fig. 2 is a fragmentary view in front elevation of the key-operated lock to control the effectiveness of the machine release lock.

Fig. 3 is a detail side View of the machine releasing mechanism.

Fig. 4 is a fragmentary view in side elevation of the means for rocking the releasing shaft to freethe machine foroperation.

General description A cash register of the type disclosed in Letters Patent of the United States, No. 1,242,170, issued to F. L. Fuller, October 9, 1917, and No. 1,619,796, issued to B. M. Shipley, March 1,

1927, has been selected to illustrate one ment of this invention.

embodi- The type of machine above referred to is usually provided with a plurality of totalizers and the necessary mechanism to accumulate amounts thereon under the control of manipulative amount and totalizer-selecting keys. main operating mechanism of such machine is The tion from the adding position known as sub-total positions, one for each group of totallzers; and three positions in the opposite direction from the adding position, known as the total positions, one for each group of When the machine was operated totalizers.

with the state-controlling lever in the adding position, amounts were added onto any of the selected totalizers.

When the machine was operated with the state-controlling lever adjusted to one of its sub-total positions, a sub-total was taken from the key-selected totalizer of the particular group selected by the position of the state-controlling lever.

The total positions of the state-controlling lever controlled the machine to print the total of, and reset the selected totalizer to zero.

In order to prevent operation of such machines with the manipulative state-controlling lever in certain of .its positions, other than the add position, bolts have been provided to prevent movement of the lever into those positions.

With such construction, when the proprietor desired to prevent operation of the machine with the state-controlling lever in its first position out of the add position, he merely turned a removable key in a lock to project a bolt or plate across the path which the state-controlling lever would have to take to reach this position, the bolt e'ffectually preventing movement of the state-controlling lever into the particular position. However, looking the state-controlling lever out of the first position, effectively locked it out of the second and third positions also. This condition is often undesirable, and is admirably overcome by applicants device, which permits free movement of the lever into any of its several positions, and functions to prevent the operation of the machinerwhen the lever occupies certain of its positions. c

Reference may be had tothe above-mentioned patents for a more thorough disclosure of the functions and operation of the machine in connection with which the present invention is i1- lustrated.

Machine lock and release Included in the machine is the usual release shaft 30 (Figs. 1, 3 and 4) journaled in the side frames 31 and 32 of the machine. These side frames correspond to the main machine frame of the machine, as disclosed in the above patents.

When it is desired to release the machine for operation, it is necessary. to rock the release shaft .30 slightly clockwise in order to release the main driving mechanism (not shown herein). A spring 33 (Fig. 4) compressed between the bottom of a slot 34 in a restoring link 35 and a spring retainer 36 on a stud 37 in an arm 38 fast on the release shaft 30, constantly tends to rock the arm 38 and the release shaft 30 in clockwise direction, but a locking detent 39 (Fig. 3) journaled on a shaft 40 supported between the side frames 31 and 32, normally restrains the release shaft 30 against the action of the spring 33 by obstructing the advance of a stud 41' carried by a locking arm 42, also fast on the release shaft 30.

The upper end wall of the slot 34 (Fig. 4) in the'link 35 lies above and apart from the stud 37 of the arm 38 carried by the release shaft 30. Arocking arm '73 pivoted at '74 to the frame of the machine, carries a roll '76 projecting into a cam race '77 formed in the side of a gear '78 journaled at 79, rotation of which gear rocks'the arm. ,A pin 72 on the arm projects into an opening -formed in the restoring link, the pin normally lying in contact with. the upper end wall of the opening '75 to support the link 35 in the position described, and shown in Fig. 4.

v To release the machine for operation, the

supported by a pair of screw studs 50 projectingrestoring spring 47.

from the side frame 32, the slide carrying a stud 51 projecting through an open slot in an arm 52 of a lever 53 pivoted on a stud '54 in the side frame 32. The release bar 48, when depressed, shifts the slide 49 to rock the lever 53 counter-clockwise against the tension of a A stud 55 carried by the other arm 56 of the lever 53 projects through an open slot in an arm 57 forming one end of a yoke 58 journaled on the shaft 40. The yoke 58 connects the arm 57 with an arm 59, the hooked end of which overlies a stud 65 carried by an arm 66 forming part'of a second yoke 68, the 7 this arm and the yoke 68 also in a clockwise direction, whereupon the arm 67 of the yoke 68, embracing the stud-69 projecting from the looking detent 39, rocks the locking detent 3Q counter-clockwise to raise the free end thereof out of the path of the stud 4l. This frees the release shaft ,30 to the action of the spring 33-(Fig. 4) which rocks the shaft 30 clockwise, as explained above, to release the machine for operation. is limitedby atail 70 on arm 38 (Fig. 4) striking a stud 71 projecting from the side frame 32.

Near the end of an operation of the machine, the release shaft 30 rocks counter-clockwise past its normal position to perform various functions, among which are that of releasing the depressed amount and transaction keys (not shown), and of restoring or permitting the, restoration of the locking detent 39 to its normal obstructing position. Mechanism for rocking the release shaft 30 counter-clockwise and then The clockwise movement of shaft 30 clockwise to the position, in which it appears in Fig. 3, will now be described.

When, upon depression of the release bar 43, the spring 33 rocks the shaft 30 clockwise, the stud 37 (Fig. 4) on the arm 38 of therelease shaft assumes aposition at or near the upper end of the slot'34 in the restoring link 35. Near the end of the operation of the machine, the gear 78 forming part of the drive mechanism of the machine has rotated sufficiently to bring a cam rise 80 in the cam groove 77 formed therein, to bear on the roll 76 of the restoring arm 73. This cam rise 30 imparts a short quick oscillation to the restoring arm '73 and, by reason of the location of the stud 72 of the restoringarm 73 in an offset notch .of the opening 75 formed inthe restoring link 35, the link is drawn downwardly past its normal position to perform the functions abovestated, and then is moved upwardly to its normal position. As the link is drawn'downwardly the upper end of the slot 34 in-the link draws the stud 37 therewith to rock the release shaft 30 and its.

locking ,arm 42 counter-clockwise past their normal 'positions, whereupon the spring 43 returns the locking detent 39 to effective position in front of the stud 4i on the locking arm 42 to lock the release shaft and the parts controlled thereby against clockwise travel past the detent.

The gear 78 makes one-half of a rotation in counter-clockwise direction at each adding opa eration of the machine, and one complete rotation in counter-clockwise direction at each total izing operation of the machine. Any suitable mcansmay be employed to effect these variable rotations.

On its reciprocatory movement, the restoring link 35 is guided by a stud 85 carried near one end ofa pitman 86 adapted. to slide over the stud 79 and supported at its left-hand end by an arm 87 of a lever 88 pivotally supported on the stud '74. The restoring link 35 on the upward movement imparted thereto by the cam rise 80, compresses spring 33 preparatory to releasing the machine for its next succeeding operation, the spring 33 operating through arm 38, and releaseshaft 30-to press the stud 41 of the locking arm c2 against the locking detent 39.

State-commie) machine Before the machine is released for operation in the manner abcve'described, various, elements therein are adjusted to set the mechanism to perform the desired operation, such asadding, sub-totalizing or totalizing. This control is principally effected in the present instance, .by the well known control lever 91 (Fig. 1) which is adjustable to a pluralityof positions corresponding to the particular. kinds of operations which it is desired to effect. It will be noted from Fig. 1 that the control lever 91 has one add position, three sub-total positions, and three total positions.

When the control lever 91 is in its add position, the various elements of the machine are adjusted to add the amounts setup on the. amount keys (not shown) into one or more of a plurality of selective totalizers .(also .not shown) with which the machineis provided.

When the control lever 91 is in any of its sub-total positions, the various elements are adjusted to take the total from the particular totalizer selected, print and indicate the total, and then replace said total on the totalizer from which it was taken.

When the lever 91 occupies any one of its three total positions, it controls the machine to take the total from a selected totalizer, print and indicate said total, and leave the totalizer from which the total was taken, standing at zero.

The machine chosen to illustrate the present invention is provided with three groups or lines of totalizers, as is fully set forth in the above patents.

The three sub-total positions and three total positions of thelever 9 1 are designated as follows: The first position from the add po-" sition in either direction is indicated by A, the second as B, and the third as C. Movement of the control lever 91 to the first position in either direction from the add position selects the same group of totalizers, namely,-the A group, for engagement with totalizer actuators (not shown).

Proprietors au'tomatic machine lock During an adding operation of the machine,

the amount set up on the amount keys 1 (not shown) may be accumulated upon one 'totalize'r Likewise, movement of the lever 9-1 to either of the B positions, or either is to be engaged selected in each of the three groupsof tctalizers (not shown). i However, when a total is taken from a totalizer, but one totalizer may be engaged with the actuators at one time. It frequently happens that the proprietor prefers to keep the totals of one or more groups or" totalizersisecret, that is, to prevent unauthorized persons from obtaining knowledge or" the totals of the amount of business transacted, or to prevent them from restoring the totalizers of certain groups to zero. Obviously, this may be, and in the past has been, accomplished by blocking the adjustment of the control lever9l out of theposition which it must occupy to selectthe particular totalizer containing the total that itis desired to keep secret. While this method is effective, it is subject to the following disadvantage, among others. Assuming that positions A control the selection of the secret totalizer, if these positions are rendered inaccessible to the control lever, the positions B and C are also made inaccessible, as the lever has to pass position. A in either direction before reaching positions and C. Likewise if the proprietor desires to render positions 13 inaccessible to the control lever 91, the A positions will be accessible, but it will be impossible for the operator to move the lever to either of the C positions, as well.

Obviously, this would materially reduce the uses to which the machine could be put.

The present invention eliminates the above objectionable condition by rendering accessible to the control lever all positions to which it may be adjusted, at the same. time effectively locking the machine against operation when the control lever occupies certain of said positions. For illustrative purposes, the invention has been so arranged as to render the machine inoperative.

when the state-controlling lever 91 is adjusted to either of is A positions. The effectiveness of this machine lock is contingent upon a tumbler or other suitable lock, the key to which may be removed and retained in possession of the proprietor or'his duly authorized agent.

The machine lock itself; is simple in structure, novel in arrangement, and adds no burden to "the operation of the machine;

The controllever 91 projects from the usual controldisk 92, a fragment of which appears in Fig. 1, journaled on a stud 93, projecting from the side frame 32. The control lever lproj ects through and is rockable along a slot formed longitudinally in a frame 94 supported on cross rods 95 and 96, extending between the side frames and 32. The side wall of the slot in' the frame 9 1 is provided wih a plurality of spaced index notches, one corresponding to each of the several positions to which the control lever 91 is adapted to be adjusted. The

lever 91 is shown in Fig. 1 as occupying the first or "11 position below the add position, namely, the A tolal position.

A thrust bar 98 is pivotally mounted near its opposite ends on the links 99 and 100, respeci tively, carries a projection or roll 97 entered in a,

cam slot 101' formed in the state-control1ing disk 92. The supporting link 99 is pivoled on a rod 102, extending between the side frames 31 and 32, and the supporting link is pivoted on a stud 103 eccentrically mounted on an actuaing disk 10a fast on the inner end of the rotatable barrel 105 of a lock 106 projecting inwardly from the side frame 32. r

The configuration of slot 101 in the present illustration is such that movement of the control lever 91, and consequently of disk 92, an equal distance in either direction from its add position rocks the supporting links 99 and 100 in counter-clockwise direction and shifts the thrust bar 98 towards the left in the direction of its length for a distance determined by the istance the control lever is moved from its add position. Stated in another Way, if the control disk 92 is rocked clockwise one step which is suilicient to shift it from its add position to its suh-total A position, the cam slot 101 co-' operating with the roller 9'7 on the thrust bar 98 rocks the latter towards the left one step. Adjustment of the control lever 91 and control disk 92 counter-clockwise from its add position to its total A position, (shown in Fig. 1),,

shifts the thrust bar 98 again towards the left in the direction of its length the same distance or single step through which the thrust bar is shifted when the lever 91 and disk 92 were moved to the .A'sub-total position.

The conformation of the slot 101 is such that the control lever 91 shifts the thrust bar 98 a variable. distance, that is, when thecontrol lever 91 is rocked two steps to one its 13 positions, it moves the thrust bar 98, farther towards the left than when the control lever is shiftedto one of its A positions. Likewise, movement of the control lever 91 toeither of its C positions imparts a still greater travel to the thrust bar98. A cam .face 110 is formed on'tne thrust bar 98 to cooperatewith a stud or projeoion 111 extending from a'link 112 pivoted at one end to a .link 113 swinging on the frame 94, and at its left (in Fig. 1) to rock the bell crank 115.clockwise and displace the stop arm or arresting memher 116 from the path of the stud 117. So long as the control lever 91 remains in its total A position, as shown in Fig. 1, however, the cam face 110 on the thrust bar 98, by contact with the stud 111, willmaintain the link 112 and bell crank 115 in the positions shown, to prevent clockwise movement of the release shaft 30, and hence prevent operation of the machine. The same condition obtains when the control lever 91 occupies its sub-total A position.

The control lever $21, when shii ted from either of its A positions to its add position, rocks the supporting links 955 and 100 clockwise and draws the thrust bar 98 towards the right to withdraw the cam face 110 from its restraining relation with the stud 111, whereupon spring 119 acts to draw link 112 to the left to rock the bell crank 115 clockwise, and lower the stop arm 116 out of the path of the stud 117. The .ma-

chine may now be released for operation by de-;

pression of the release bar 48, as described above.

If the control lever 91 is moved to its subtotal A position, the same locking condition prevails, inasmuch as the cam face 110 is brought to the same position in which it shown in Fig. 1. When, however, the lever 91 is shifted to either of its B or C positions, the conformation of the slot 101 will operate to rock the supporting links 99 and 100 farther counterclockwise, thereby shifting the thrust bar 98 farthertowards the left. and withdrawing the cam face 110 from its restraining or effective po sition. This, of course, permitsthe spring 119 to render the arresting means lldinefiectivc, as

explained above.

As heretofore stated, the proprietor his agent may wish to read or reset the totalizer c1 totalizers of lineor group ,A containing the secret totals, at certain intervals, for instance, at the end of the days business, or at the end of each week. To do so, he inserts a key 120 (Fig. 2) into the lock 106 rotates the barrel 105 thereof counter-clockwise, viewed in Fig. 1, thus rotating the actuating disk 104 to which the lower end of the supporting link 100 is pivoted. This rotation, through the eccentric mounting of the link 100 on the actuating disk,

'lowers the link and the thrust bar 98 to with draw the cam face 110 from its restraining position, whereupon spring 119 rocks the stop arm llfi'to'free therelease shaft 30 to the control of the locking dctent 39 (Fig. 3), which, when displaced from the path'of stud 41011 the locking arm 12-, .by depression of the release bar frees'the machine for. operation. After having read or reset the particular totalizer or totalizeis desired, the proprietor, by means of his 120, returns thebarrel 103 of the lock 106 and the actuating disk 104 to the'positiom shown in Fig. 1, thereby. raisingthe link 100 and the thrust par 98 to restore the stop arm 116 to its effective blocking position. I

It is evident that by variously forming the cam slot 101 or the cam face 110 or both, the effectiveness of the stop arm 116 may be varied to enable the controlling lever to prevent operation of the machine when it is in any one or more of its pairs of corresponding positions above and below the add position.

The spring 33 (Fig. 4) which tends to turn the release shaft 30 in clockwise dir cticn is stronger than the spring 119 (Fig. 1) whic operates through the link 112.te disable the stop arm or arresting means 116. Therefore, to prevent the force of the release shaft spring exerted through the shaft, from retarding or entirely preventing the spring 119 from disabling thearresting member 116, the detent 3G is slightly longer than the stop arm 116, to sustain the pressure exerted by the spring 33.

Also, it'is evident that in the example shown, the stop arm or arresting member 116 remains where adjusted by its spring 119 and is not restored to effective position relatively to the re lease shaft 30 except by the adjustment of control lever to such position that the thrust bar 98 effectively operates the arresting member.

Hence it is desirable to use this type of machine lock in connection with the usual form of machine lock typified by thelocking detent 39, 15'

to insurethe retention of the release shaft in locked position at the end of every operation of themachine. I

It may be desirable to preserve a record of the number of times the lock 106 is actuated, so

tor may know if the lock has been operated by a person unauthorized to read or reset the total" izer. For this purpose a step-by-step counter of the Veeder type, or any other suitable type,

is attached to the machine as indicated at 125' The operating crank 126. for this (Fig. 1).

, ment thereof.

counter is pivotally connected to a pitman'127 forked at its inner end to slidably embrace a circumferentially grooved collar 1'28 surrounding the barrel 165 of the locklOS. A stud 129 on the pitman 12'? projects into the path of a shoulder 01111116 periphery of the actuating disk 104. When the barrel of the lock 106 turns counter-clockwise to renderthe stop arm 116 ineffective, the actuating disk 104;- operating on stud 129, shifts thepitman 127 towards the left, rocking the crank 126 clockwise to advance the counter one step. When the key-120 is turned clockwise to return the barrel105 and disk 10% in clockwise direction to render the stop arm 116 effective, a spring 130 restores the pitman 127 tothe position in which it is shown in Fig. 1, thereby rocking the crank 126 counterclockwise preparatory to another driving m0ve- While th form of mechanism herein shown described is admirably adapted to fulfill the objects primarily stated, it is to be under! stood that it is not intended to confine the invention. to the one form or embodiment herein disclosed, for it is susceptible of embodiment in various forms all coming Within the scope of the claims which follow. a I

What is claimed as new, is:

1. In a mach-c ne of the class described; the combination with a release shaft; means to rock said release shaft to release, the machine for operation; mcansto obstruct the releasing movement of the shaft; and means to displace such. o rooting means; of a second means inf of the first-named obstructing means,

to lock the machine against operation; means to disable the last-named locking means; and a plurality of manipulative means to control the effectiveness of the second-named disabling 1neans.

2. in a machine of the class described; the combination with a release shaft; means to rock said release shaft; a means to obstruct the rocking of the release shaft in one direction; and means to displacethe obstructing means; of second to obstruct the rocking movement of the release shaft in one direction; a to disable the second-named obstructing and a plurality of manipulative means to action of said spring.

a machine of the class described; the ion with a release shaft; and means to a releasing movement of movable obstruct the releasingmovement of the shaft; 2, spring to displace suchobstructing means; a thrust member to set the obstructing means to effective position against the tension of the spring; and a plurality of means to disable the thrust member to enable the spring tobecome effective. 1

4. In a normally locked machine of the class described, the combination with a machine release sh ft; and means to turn the shaft in its releasing direction; of a stop arm to obstrnct the movement of the shaft in suchdirection; a conncctedto the stop arm, a spring to actuatethe link to disable the stop arm; and I to restrain the link against operation by 1 one spring to link to disable the stop arm; means operable upon the link to retain the stop arm in effective position; and means to withdraw the retaining means. p

6. In a machine of the class escribed; combination With a release shaft; and means to turn the shaft in its releasing direction; of means to prevent movement of the shaft in such direction, including a shiftable arrestin bar, and a link to control the position of the arresting member; a spring to render the arresting member ineffective; a thrust bar operable upon the link to retain the stop arm effective; and a plurality of separately operable means to withdraw the thrust bar.

'7. In a normally locked machine of the class described; the combination with a machine lease shaft; of means to prev nt releasing move ment of the shaft, including an arresting member shiftable to effective and ineffective positions; an adjustable device movable into a plurality of positions; means controlled by the adjustable device, when moved into any one of its positions, to determine the effectiess of. the arresting member; and manipulative means render the arresting member ineffective when the adjustable device is in any one of the positions in which the device renders the arrestingmember effective.

' 8. In a normally locked machine of the class described; the combination with a machine relea e shaft; of means to prevent releasing move-- ment of the shaft, including an arresting member shiftable into and out of effective position; an adjustable device movable into a plurality of positions; means controlled by the adjustable device, when moved into any one of its positions, to determine the effectiveness of the arresting means; and means operable upon the means controlled by the adjustable device to render the arresting means ineifective when the adjustable device is in any one of the positions in which the device renders the arrestingmeinber eifec tive.

9. In a normally locked machine of the described, the combination with a machine release shaft; and means to give the shaft a releasing movement; of a shiftable locking means to prevent the releasing movement of the shaft; adjustable means to control the effectiveness of the shiftable locking means; and means to render the locking means inefiective when adjustablenieans is set to any one of plurality of positions to render the locking means operative.

10. In a machine of the class described, the combination with an adjustable control revise; of an arresting member; a pivotally supported thrust bar differentially shiftable by the control device todetermine the effectiveness of the arresting member; and a manually operated lock to control the effectiveness of the thrust bar.

11. Ina machine of the class described, the combination with an adjustablecontrcl device having a cam; of an arresting member; a pivotally. supported thrust bar shiftable by the cam of the control device to determine the eilectiva ness of the arresting member; manually op erable lock member; and a link to connect lock member andthe thrust to enable UL-xv lock member to determine the effectiveness or" the thrust member. I p

12. In a machine of the class described, the combination with an arresting member shiftable into and out of effective position; and an adjust-- into and out of effective position; and an adjustable control device; of means tending to shift the arresting member to one of, its positions; a thrust member pivot-ally, supported for. differential movement in one direction and for constant movement at substantial right angles thereto. and operable the control device to determine effectiveness of member; and means operable upon the thrust member to determ ne its eifectiveness regardless of the control device. v

14;. In a machine of the class described; the combination who a release shaft; means to rock said release to release the machine for operation; means to obstruct the releasing movement of the" shaft; means b0 displace such obstructing means; of a second means adaptedto obstructthe releasing movement of the shaft; means to disable the second named obstructing means; a device to preventoperation of the disabling means; and a differentially adjustable member to render said device ineffective when the differentially adjustable member is in certain of its fully adjusted positions only.

15. In a machine ofthe class described; the combination with a release shaft; means to rock said release shaft to release the machine for operation; means to obstruct the releasing movement of the shaft; means to displace such obstructing means; or" a second means adapted to obstruct the releasing movement of the shaft; means to displace the second-named obstructing means; a member pivotally supported for dif ferential movement in one direction and for constant movement in another direction to determine the cffectivity of said disabling means; and a plurality of manipulative devices to operate said member.

16. In a machine of the class described; the combination with a release shaft; means to rock release shaft to release the machine for operation; means to obstruct the releasing move-. ment of the shaft; means to displace such obstructing means; of a second means adapted to obstruct the releasing movement of the shaft; means to displace the second-named obstructing means; a member pivotally supported for differential movement in one direction and for constant movement another direction to determine the effectivity of said disabling means; differentially adjustable means to give said mem- -er its differential movement; and a constantly movable means to give said member its constant movement.

1?.111 a machine of; the class described; the combination with a release shaft; and means to rock the shaft to release the machine; of means to obstruct the releasing movement of the shaft; a member connected to the obstructing means; resilient means to actuate the member to dis able the obstructing means; an adjustable de-- vice adapted when moved to a certain controlling position to restrain the member against operationby the resilient means to prevent the disabling of the obstructing means.

the arresting 19. In a machine of the class described; the combination with a release shaft; and means to rock the'shaft to release the machine; of means toobstruct the releasing movement of the shaft: a member connected to the obstructing means; resilient means to actuate the member to disable the obstructing means; an adjustable device adapted when :moved'to a' certainposition to restrainthe member against operation by the resilientmeans to prevent the disabling the obstructing means; a differentially adjustable element to control said device; and a manually operable member connected to said device to control the eifectivity thereof.

20. In a machine of the class described; the combination of a release shaft; arresting means therefor; an adjustable control device having carnming means; a thrust bar supported by a pair of. links, the pivot of the bar of one link cooperating with the camming means whereby the latter may effect movement of the thrust bar to determine the effectivity of the arresting means; and means cooperating with and con-' nected to the other supporting link for the thrust bar to determine the effectivity of the thrust bar.

21. In a normally described; the combination. of a control device having a normal position and a plurality of positions of adjustment; a machine release shaft; arresting means therefor; and means controllable by the control device whereby the arresting means is ineifective when the control device is in its normal position, and effective when the control device is in any one of a certain plurality of its controlling positions of adjustment.

22. In a normally locked machine of the class described; the combination of a control device having a normal position and a plurality of positions of adjustment; a machine release shaft; arresting means therefor; and means controllable by the control device whereby the arresting means is ineffective when the control device is in its normal position, and eifective when the control device is in any one of a certain plurality of its positions of adjustment;

and means to determine the effectivity of the controllable means regardless of the position of the control device. 7

23. In a machine of the class described; the combination of a releaseshaft; arresting means therefor; an adjustable control device; a member cooperating with the arresting means; a pair of links supporting said member, both of locked machine of the class lid said links being rockable by the adjustable control device to operatesaid member to determine the eifectivity of the arresting means; and means to shift one of the links substantially in the direction of its length to rock said member to- 

